4A molecular sieve

4A molecular sieve is an alkali metal aluminosilicate, which can adsorb water, NH3, H2S, sulfur dioxide, carbon dioxide, C2H5OH, C2H6, C2H4 and other critical molecular diameter of not more than 4A. Widely used in gas, liquid drying, can also be used for some gas or liquid purification and purification, such as the preparation of argon.

Porous materials have been widely used in many fields, such as microporous 4a molecular sieves as the main catalytic materials, adsorptive separation materials and ion exchange materials, and play an increasingly important role in petroleum processing, petrochemical, fine chemical and daily chemical industry. .

Molecular sieve 4a (also known as synthetic zeolite) is an aluminosilicate microporous crystal. It is composed of silicon oxide, aluminum oxide tetrahedron basic skeleton structure, there are metal cations in the lattice (such as Na +, K +, Ca2 +, Li +, etc.) to balance the excess negative charge in the crystal. The type of molecular sieve according to its crystal structure is divided into: A type, X type, Y type.

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